On-Chip Microwave Quantum Hall Circulator
Abstract
Circulators are non-reciprocal circuit elements integral to technologies including radar systems, microwave communication transceivers, and the readout of quantum information devices. Their non-reciprocity arises from the interference of microwaves over the centimetre-scale of the signal wavelength in the presence of bulky magnetic media that break time-reversal symmetry. Here we realize a completely passive on-chip microwave circulator with size one-thousandth the wavelength by exploiting the chiral, slow-light response of a 2-dimensional electron gas (2DEG) in the quantum Hall regime. For an integrated GaAs device with 330 um diameter and 1 GHz centre frequency, a non-reciprocity of 25 dB is observed over a 50 MHz bandwidth. Furthermore, the direction of circulation can be selected dynamically by varying the magnetic field, an aspect that may enable reconfigurable passive routing of microwave signals on-chip.
Cite
@article{arxiv.1601.00634,
title = {On-Chip Microwave Quantum Hall Circulator},
author = {A. C. Mahoney and J. I. Colless and S. J. Pauka and J. M. Hornibrook and J. D. Watson and G. C. Gardner and M. J. Manfra and A. C. Doherty and D. J. Reilly},
journal= {arXiv preprint arXiv:1601.00634},
year = {2017}
}